Drawing a collection of 3D models at the vertices of another 3D model

Hello all,

I’m trying to draw some 3D models that I’m loading with ofxAssimpModelLoader. I’m able to draw the first 3D model successfully as I followed the assimpLoader example in oF. However, I need to draw a collection of the second 3D model at each of the vertex of the first 3D model. Here’s my code.

#include "ofApp.h"

CoinObject::CoinObject() {
  model.loadModel("HighCoin.obj", true);
  model.setRotation(0, 0, 0, 0, 0);
  model.setScale(0.9, 0.9, 0.9);
}

//--------------------------------------------------------------
void ofApp::setup(){
  ofBackground(ofColor::black);
  ofSetVerticalSync(true);
  
  // Load the 1st 3D model.
  humanModel.loadModel("Breathing.dae", false);
  humanModel.setPosition(0, 0, 0);
  humanModel.setRotation(0, 180, 0, 0, 1);
  humanModel.setScale(1.5, 1.5, 1.5);
  humanModel.setLoopStateForAllAnimations(OF_LOOP_NORMAL);
  humanModel.setPausedForAllAnimations(false);
  humanModel.playAllAnimations();
  humanMesh = humanModel.getCurrentAnimatedMesh(0);
  
  topLight.setPosition(0, 500, 500);
  bottomLight.setPosition(0, -500, 500);
  
  ofEnableBlendMode(OF_BLENDMODE_ALPHA);
  
  // Create a collection of 2nd 3D model for each vertex of the mesh.
  auto vertexCount = humanMesh.getVertices().size();
  for (int i = 0; i < vertexCount; i++) {
    CoinObject  *coin = new CoinObject();
    coins.push_back(coin);
  }
}

//--------------------------------------------------------------
void ofApp::update(){
  humanModel.update();
  humanMesh = humanModel.getCurrentAnimatedMesh(0);
}

//--------------------------------------------------------------
void ofApp::draw(){
  ofEnableDepthTest();
    ofEnableLighting();
      topLight.enable();
      bottomLight.enable();
      ofPushMatrix();
        cam.begin();
          drawMeshVertices();
        cam.end();
      ofPopMatrix();
      bottomLight.disable();
      topLight.disable();
    ofDisableLighting;
  ofDisableDepthTest();
}

void ofApp::drawMeshVertices() {
  ofPushMatrix();
    ofFill();
    ofSetColor(ofColor::red);
    ofxAssimpMeshHelper & meshHelper = humanModel.getMeshHelper(0);
    ofMultMatrix(humanModel.getModelMatrix());
    ofMultMatrix(meshHelper.matrix);
    for (int i = 0; i < humanMesh.getVertices().size(); i++) {
      // None of the coins can be seen on the screen. 
      coins[i] -> model.drawFaces();
    }
  ofPopMatrix();
}

I need to call ofMultMatrix twice to draw the mesh for the 1st 3D model. I tried calling that for the 2nd model as well before the drawFaces call on the coin model, but nothing shows up on the screen. Any suggestion/advice? Thanks in advance :slight_smile:

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